21173052 has 24 divisors (see below), whose sum is σ = 50101632. Its totient is φ = 6958000.

The previous prime is 21173029. The next prime is 21173057. The reversal of 21173052 is 25037112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21173057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11574 + ... + 13277.

It is an arithmetic number, because the mean of its divisors is an integer number (2087568).

Almost surely, 2^21173052 is an apocalyptic number.

It is an amenable number.

21173052 is an abundant number, since it is smaller than the sum of its proper divisors (28928580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21173052 is a wasteful number, since it uses less digits than its factorization.

21173052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24929 (or 24927 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 21173052 is about 4601.4184769482. The cubic root of 21173052 is about 276.6481825041.

The spelling of 21173052 in words is "twenty-one million, one hundred seventy-three thousand, fifty-two".